Khafiza AfzalCIIT/FA19-BST-003/LHRDr. Riffat JabeenLHR TP 99382026-01-062020-04-01https://repository.cuilahore.edu.pk/handle/123456789/183Calibration is frequently used to improve the population parameter estimation’s accuracy using auxiliary data. In our study, we have introduced the calibration and the calibration log variance estimator for estimating the population variance. The study proposes the calibration variance log estimators using chi square distance measure and different calibration constraints respectively. Our findings indicate that the suggested calibration variance estimator performed better than the existing estimator.SOCIAL SCIENCES::Statistics, computer and systems science::StatisticsFA20Dr. Riffat JabeenCalibration LogRatio EstimatorPopulation VarianceThesis